I have messed with Qt a little, mostly because I want to have applications that run on Windows and on Linux. When I went to the Troll tech web site it looks like only the unix version of Qt is released to be free for non commercial applications. I just gave up on Qt at that point and moved to GTK+ even though the Windows port is much less mature. I don't mind the "free unless it's commercial" (Whichever TLA you wan't) license, but it seems the the Qt library was playing the same way as MySQL (Now GPL). You have to buy a Windows license if you want more than a trial version.
Or am I just reading it wrong?